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About

Summary: Mount Sinai South Nassau is a nonprofit teaching hospital located in Oceanside, NY (Long Island). Key details: - Services: Acute-care hospital offering cancer treatment, cardiac care, orthopedics (joint replacement), bariatric surgery, radiology, women’s health, emergency and elective angioplasty, and comprehensive outpatient centers. It operates as a designated Stroke Center and a Comprehensive Community Cancer Center, with specialized radiosurgery technologies (Novalis Tx and Gamma Knife Perfexion). - Size and scope: About 455 hospital beds, over 900 physicians, and around 3,000 employees; parent organization notes include 778 employees (YoY data) and annual revenue around $58.2M. - Affiliation and status: Not-for-profit hospital with affiliation to Mount Sinai; part of Mount Sinai Health System network. - Location and reach: One primary campus in Oceanside, plus related outpatient sites within the region. Contact: 516-632-3000. - Recognition: Bariatric Surgery Center of Excellence designation and cancer/stroke center recognitions by relevant authorities. - Employment and opportunities: Active employer with multiple job postings and programs (education, volunteer service, online registration, telehealth). If you’re specifically looking for Mount Sinai Doctors on Long Island in North Hempstead, this page confirms Mount Sinai South Nassau’s Oceanside campus and broader Mount Sinai affiliation on Long Island, but it does not list a distinct “Mount Sinai Doctors” location in North Hempstead. If you need a North Hempstead–specific Mount Sinai Doctors address or provider directory, I can search for that or provide alternatives in North Hempstead.

Clinic Type

Gastroenterology

Address

Mount Sinai Doctors on Long Island, a Campus of Mount Sinai, Long Island, NY

Phone

+18006374624

Email

international.services@mountsinai.org

Opening Hours

Opens before 9 am; Open after 5 pm

Services Offered

  • Gastroenterology
  • Colon cancer screening
  • Endoscopy
  • Colonoscopy
  • GI tract diagnosis and treatment
  • Digestive disorders treatment

Team

  • Mount Sinai Doctors on Long Island gastroenterology team — Gastroenterology clinicians

Insurance & Payment

  • Insurance View All
  • Accepting New Patients

Languages Spoken

  • Language View All

FAQs

What services does the gastroenterology team provide?

Diagnose and treat GI tract conditions; perform colonoscopies and endoscopies.

What types of GI conditions do you diagnose and treat?

We diagnose and treat all types of gastrointestinal (GI) tract conditions and perform colonoscopies and endoscopies.

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Birdeye: 1 out of 5 stars (3 reviews)
  • BestProsInTown: Varies; often mixed reviews across aggregate sites (104 reviews (BestProsInTown))

Patients praise

  • Some patients report positive experiences with specific doctors they find kind, caring, and knowledgeable
  • Generally perceived as providing comprehensive medical care when access is successful
  • Some staff members noted as being helpful and thorough in specific instances

Common complaints

  • Difficulty scheduling appointments and long wait times
  • Poor communication and rude behavior from administrative/front desk staff
  • Issues with phone systems and inability to reach doctors directly
  • Concerns regarding unprofessionalism and dismissive attitude from some medical providers
  • Administrative errors regarding prescriptions, referrals, and medical records

"This group of doctors are beyond unprofessional. During a visit with a nurse practitioner she proceeded to call me fat and put down my body multiple times."

Birdeye (Review)

"First to get an appointment is like jumping though hoops... You then speak to the office manager & she is as helpful as a doorknob, making assumptions & excuses regarding her staff or blames the doctor for being too thorough."

LocalityBiz (Review)

"Patients praise the doctors, nurses, and staff for their attentive care, thorough examinations, and good medical treatment. The facility offers a range of services, including access to physician assistants for quick appointments."

BestProsInTown (Review Summary)

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

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